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jimfred on 07/30/09

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PropertyGrid values in hex/hexadecimal using class derived from TypeConverter

/ Published in: C#

Displaying values as hex in a PropertyGrid by using a TypeConverter class. The TypeConverter class is assigned as a property to the PropertyGrid's data element.

Consider improving by making the UInt32HexTypeConverter a generic/template as in HexTypeConverter. Also, consider deriving from BaseNumberConverter .

See 'How to: Implement a Type Converter' in MSDN

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// Included...
// [1] Define TypeConverter class for hex.
// [2] use it when defining a member of a data class using attribute TypeConverter.
// [3] Connect the data class to a PropertyGrid.

// [1] define UInt32HexTypeConverter is-a TypeConverter
public class UInt32HexTypeConverter : TypeConverter
{
   public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
   {
      if (sourceType == typeof(string))
      {
         return true;
      }
      else
      {
         return base.CanConvertFrom(context, sourceType);
      }
   }

public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
   {
      if (destinationType == typeof(string))
      {
         return true;
      }
      else
      {
         return base.CanConvertTo(context, destinationType);
      }
   }

public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
   {
      if (destinationType == typeof(string) && value.GetType() == typeof(UInt32))
      {
         return string.Format("0x{0:X8}", value);
      }
      else
      {
         return base.ConvertTo(context, culture, value, destinationType);
      }
   }

public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
   {
      if (value.GetType() == typeof(string))
      {
         string input = (string)value;

if (input.StartsWith("0x", StringComparison.OrdinalIgnoreCase))
         {
            input = input.Substring(2);
         }

return UInt32.Parse(input, System.Globalization.NumberStyles.HexNumber, culture);
      }
      else
      {
         return base.ConvertFrom(context, culture, value);
      }
   }
} // UInt32HexTypeConverter used by grid to display hex.

// [2] define a class for data to be associated with the PropertyGrid.
      [DefaultPropertyAttribute("Name")]
      public class Data 
.
.
.
         public UInt32 stat;
         [CategoryAttribute("Main Scanner"), DescriptionAttribute("Status"), TypeConverter(typeof(UInt32HexTypeConverter))]
         public UInt32 Status
         {
            get { return stat; }
         }
.
.
.
// [3] reference data for propertyGrid. (here, myData is a Data).
         propertyGrid1.SelectedObject = myData ;

URL: http://koniosis.blogspot.com/2009/02/integers-as-hex-in-propertygrid-c-net.html

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